https://www.youtube.com/watch?v=WWQ3iLVr-0E>That cylinder is a mass dampener also known as a J dampener in physics.The purpose is to neutralize high frequency low amplitude oscillations.Mass dampeners are currently used in Moto GP and were banned in F1 in the mid 2000s.The mass dampener can also be placed on the fork,above the bottom bracket and as shown on the rear swing arm/triangle on a full suspension bike.have these been used on road bikes yet? i have a stiff track bike fixie, anything that could improve performance or comfort would interest me. i haven't paid attention to bike stuff lately so idk if it has been mentioned on GCN/GMBN yet. GCN has done a lot of videos on tire pressure so i could see them experimenting with tuned mass dampers.